Black mono-azo dye and process of making.



tioued retnuremenls r1- FRANZ sononn or HOG."ST-ONJHE-MAIN,

LUOEUS & immune, o1 Ht'jCHST-ON-EHEJ/IAyTN. GERMANY, A

VORl'tI. M1315: CORPORATION JE GERll'lflN-Y.

JLAe

GERMANY, ASSIGNOR 'l-O FABBWERKE BLACK MONO-A33 AND PROfiESS OE? MAKING.

13 (Win No Throwing.

It; all tell/nu it may co'necri'ic lie it. known that; l uaxz F ction, l "h. i), chemist. a citizen of the Empire of Ger man r "itliug at tlochst-oirthe-itlaiu. Ger Niall t. have lilflflli at certain new and nse'liul l,inprmements in the ll'lauul at-ture oi" a Black itlono iixo Dyestutlf Dyeing on ltlor dants. ol which the following; is a speciliea tion.

The L'Otlltlltlllfllifi in respect of llltE il IlHiless of the dyestul'l': used for last wool, dyeing have continually increased of late. This is particularly the case with black dyestull's. for which a degree of l astne--s is demanded such as is po azssed by only few dyestutt's.

the axo-dye tuli's only the so-ealled chrome dyestutis enter into coi'isideration, as their chrome lakes. produced on the liher are in many ca es of great l astness to light, hot-pressing (shrinking) and. milling; however in very few cases do they :fuh'il all the. claims lately made upon them.

A black dyestul'l' is expected to he not only sutlieiently fast to light, milling and hot:- pressing, but; also to be last to boiling water and to acid, that; it to say, to possess the s :alled 't'ast'noss-to potting and to acid boil inn; in addition further exce sive requirements are made as to the other properties ot the d tull'. ll. must; be readily soluhle. dye {.terfeetly evenly and the baths must he rout pletely exhausted. because a dyestull' which does not have these properties cannot be used in su h an important oranch o'l i'astdyeing as the machine dyeing, and because. in case of the hath not being entirely exhausted. it is impossible or rely dillieult to continue the dyeing in the same hath.

it further requirement. in addition to those aforesaid is the licauty of the tint.

Hitherto no axo-dyestull' has been known which. besides lullilling all the above menh titling lastness to light, hot n'essiug, milling and to potting and acid boiling. also dyes a beautiful. bloom .'l )l( --l)lillHl) lilzurl; ,tiut: WlllCll is moreover readily soluble and capable of hein completely exhausted ll'mll the loath and ol dyeing perfectly evenly. Now i have tonnd that sueh a tlvrstull. dyeing on mordants. can he produced easily by combining diauotiya l l-chloro l-aniimmhenol with antiuonanhtholsultonio acid in a neutral or Specification of Letters Patent.

t l l i l l l l t l l t t l l i l l l l Ella 24 191 o- .hljipliclillfin filed August 5, 1909. Serial No. 511367.

slightly alkaline solution or a solution containing; lime as an alkali. y

This invention is all the more surprising laarause already a number of combinations ol ortlio-ai'uinophenol derivaties with 1.8.5- aininouuplitholsnlfonio acid are. known. However none of these combinations can be used for dyeing a bluish-black having at the same. time the aforesaid properties of fastin iilany of those known dyestutls do not dye blacl: tints at all. The remaining dyestutl's fail in respect. of their properties of fastne s. especially their tastness to light. This is horue out by the opinion prevalent among dyers that ortho-amiuophonol-azodyestuli's of the peri-aiuinonaphtholsulitonie acids are not at all fast. to light.

it is a. surprising fact thatthe present new dyestutl is extremely fast to light.

Taking the qualities of this dyestufi' in respect of fastness'and dyeing power as a whole, the dyestu'tl' surpasses all the known dyes-tufts 0t its class in such a remarkable manner that its discovery means a considerable technical improvement, and progress.

The following examples illustrate the in Vention:

Example l l i-.2) kilos of l;-chl0ro-9-aminophenol are dis. wired in 2% kilos of hydrochloric acid 0t 30 per cent. strength and water. and then diazotized with a suti'ieient quantity (6 0 kilos} of sodium nitrite. The diam-solution is mixed with a paste of 25 kilos of 1.8.5-an'iino-naphtholsultonic acid in water and into this mixture caustic soda lye diluted with water is run until the n1ixture is neutral or there is an excess of soda, the iass'heiug cooled at the same time 'by adding iee. After stirring for several hours the mass is heated, the excess of caustic soda lye, which may be present, is neutralized by means of an. acid or a bicarbonate and the (.lyestuti' salted out by adding the requisite quantity of salt. The dried (lyestutl' forms a dark powder having a metallic luster, readily soluble in water. pretty readily soluble in alcohol insoluble in benzene an ligroin, dyeing perfectly evenly a beautiful hlooiny violet-bluish-blaek tint and fast to light, hot-pressing, milling and to potting and acid boiling.

ilxample H: 14 3 kilos of? 4:L'lll0l'02 aminopheuol are diazotixed as above doscribed. The diazo-solution is run into a solution of 25 kilos of 1.8.5an1inonaphtholsulfonic acid in milk of lime containing 15 kilos of slulted liine. After the coupling is complete, the mass is heated, converted into its sodium salt by means of carbonate of soda, filtered and salted out. Alternatively,

, the milk of lime inav be added to the mixture of \tlie diazo-shlution with the amino nuplitholsulfonic acid.

Having now particularly described my invention, Wllzlt I claim is:

l. The process of manufacturing U. black mono-azo-dyestufi dyeing on mordants, which consists in combining the di:1zo-co1npound of the l-chloro-Q-aininophenol With 1.8.5-sminonaplitllolsulfonic acid, substantially as described.

eesym 2. As a new article of manufacture, a black niono-azo-dyestufi, dyeing on mordants, of the constitution: 4-chloro-2-diazohenol-l.8.5 aminonaphtholsulfonic acid,

eing a dark powder of a metallic luster, readily soluble in Water, pretty readily soluble in alcohol, insoluble in benzene and ligroin, dyeing perfectly evenly a beautiful I blooniy violet-bluish-black tint, fast to light, I

l l l l I l hot-pressing, milling and to potting and acid boiling, substantially as described.

In testimony whereof, I atiix my signature in presence of two witnesses.

FRANZ SCHOLL.

JEAN GRUND, 

